#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b;
	char c;
	cin>>a>>b>>c;
	if(c=='+') cout<<a+b;
	if(c=='-') cout<<a-b;
	if(c=='*') cout<<a*b;
	if(c=='/'&&b!=0) cout<<a/b;
	if(c!='+'&&c!='-'&&c!='*'&&c!='/') cout<<"Invalid operator!"; 
	if(c=='/'&&b==0) cout<<"Divided by zero!";
	return 0;
}